122 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Stiremetra lusitanica A. H. Clark, The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 40 

 (range). — Nobre, Echinodermes de Portugal, 1931, p. 163 (records). — Mortensen, Handbook 

 of the echinoderms of the British Isles, 1927, p. 25 (localities). — Nobre, Echinodermes de 

 Portugal, 1938, p. 186 (description; notes). 



Diagnostic features. — The cirri are irregularly arranged on the centre-dorsal, 

 roughly in 15 columns; the division series and arm bases are perfectly smooth dorsally 

 with sharp, straight, unmodified lateral edges and the middorsal region roundedly 

 carinate; the 10-14 (usually 10) arms, with the IIBr series either 2 or 4(3+4), are 

 about 60 mm. long, and the cirri, which are rather stout, are nearly 30 mm. long with 

 50-56 segments. 



Description. — The centrodorsal is hemispherical, roughened at the dorsal pole. 



The cirri are XII-XV, about 50, nearly 30 mm. long. The first three or four seg- 

 ments are quite short, the three following much longer, and those succeeding longer 

 than broad but becoming gradually shorter up to the fifteenth or twentieth; from this 

 point (or earlier) to the end of the cirri the segments have a well marked dorsal spine 

 which becomes slightly less distinct on those just preceding the terminal claw. 



The radials are scarcely visible except sometimes in the interradial angles. The 

 IBr ( are short and trapezoidal with a strong median ridge which is continued on to the 

 axillaries. The IBr 2 (axillaries) are short, broad, and pentagonal with slight backward 

 projections in the middle of the proximal border. The axillaries and first two brachials 

 have sharp straight edges and flattened sides. The IIBr series (when present) are 2. 



The 10-12 (usually 10) arms are about 60 mm. long, with smooth elongate brachials. 

 The first brachials are not much incised, and the outer portions of their dorsal surface 

 are usually much less convex than the remainder. The second brachials project more or 

 less proximally into the. first. They and the first syzygial pairs (composed of brachials 

 3+4) are somewhat flattened on the inner side. The three following brachials are 

 squarish, those following more elongated with very oblique ends. 



Syzygies occur between brachials 3 + 4 and 15+16 or 16+17. 



Pi is moderately long with about 15 broad segments. The lower segments are 

 stout and wide with the outer sides somewhat flattened; the second and three or four 

 following segments have their inner edges produced into strong and prominent keels 

 which are slightly folded upward; these keels are continued, though less developed, 

 on to the later segments. The pinnules following are altogether smaller, consisting of 

 but a few slender segments. 



The disk is 5 nun. in diameter and is thickly covered with numerous small plates, 

 those at the sides of the ambulacra being rather more regularly arranged than the rest. 

 The pinnule ambulacra arc not well defined, but the sacculi are moderately developed. 



The color in alcohol is brownish or greenish w r hite. 



Notes. — The preceding description is adapted from Carpenter's original description 

 published in 1884, supplemented with additional information from his redescription 

 published in 1888. 



According to Koehler all the specimens from Princesse-Alice stations 1236 and 1713 

 had 10 arms. Of the three specimens from Princesse-Alice station 2048 two had 10 arms 

 and one had 11. Of the specimens from Princesse-Alice station 806 nine had 10 arms; 

 in four all the arms were broken off at the first syzygy; three had more than 10 arms, 

 one having 1 1 , one 12, and one 13. 



